KOSPI · April 1, 2026

Weeks, not years

+8.44%

single-day change vs previous close

Part of a longer stretch

Four weeks to undo a war

early in it · 2026-03-31 → 2026-04-21, +26.44% over the whole period

What happened that day?

The KOSPI rose 8.44% to close at 5,478.70. The previous session had been the bottom of the episode
The trigger was word from the American side that the war could end within weeks
A buy-side sidecar was triggered during the session — the brake that slows trading when buy orders, not sell orders, pile up
The United States and Iran did agree a two-week ceasefire seven days later, on 8 April
The fall reversed quickly because of what it was. Earnings had not collapsed; the market had been pressed down by a single event
Declines of that kind snap back once the event lifts
The index kept climbing and regained its previous high in late April

Sources

Every figure on this page is recomputed from the original daily closing prices and checked against them at build time. The account of what happened is put together from the public record; where a specific source was consulted it is listed above.